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Single Class Progression is a replacer for the base 3.5E class system. In fact it bear a lot of likeness with the system of the 2nd and 1st editions. You can only progress in the class (or set of class) you chosen in the beginning. Goodbye optimization!

Hit Point Dice is a medium of both (or three) class and round up or down to the closest dice. (by example a Fighter/Wizard, <math>(10+4)/2=7</math> round up so 8) the final dice cannot exceed the double the lowest dice in the multiclass combo (someone with a wizard multiclass cannot exceed d8).

30% XP penalty for any multiclass, you must pursue two path after all.